Portion of a display screen showing a user interface



The FIGURE is a front view of a portion of a display screen showing a user interface of our new design.

The outer broken line is for the purpose of illustrating an unclaimed portion of a display screen and forms no part of the claimed design. The broken line text and images located within the outer broken line are included for the purpose of illustrating unclaimed environment and form no part of the claimed design. 

The ornamental design for portion of a display screen showing a user interface, as shown. 